Science one-word quiz

Write a one-word answer for each question.

1. The lightest gas

2. The force that pulls objects towards the Earth

3. The organ that pumps blood around the body

4. Animals that eat both plants and animals are called

5. The organ we use for seeing

6. The process by which a seed starts to grow into a plant

7. The pigment in red blood cells that carries oxygen

8. The part of a plant that absorbs water from the soil

9. The process by which green plants make their food

10. Water vapour changing back into liquid water

11. The gas we breathe in to stay alive

12. The largest organ of the human body

13. Frozen water is called

14. The instrument used to measure atmospheric pressure

15. The instrument used to see very tiny things

16. The green pigment in leaves

17. The bouncing back of light from a surface

18. The control centre of a cell

19. The organ we use for hearing

20. The SI unit of mass

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